Milestones

Ten years ago: Argentinian President Raul Alfonsin obtained the surrender of dozens of armed rebel soldiers who had been holed up at a military base for three days.

Five years ago: After six days, engineers plugged the tunnel leak under the Chicago River that caused an underground flood that had virtually shut down business in the heart of the city.

One year ago: On the first anniversary of the Oklahoma City bombing, hundreds of mourners paused for 168 seconds of silence at the site where the federal building once stood.